Refrigerating apparatus



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UNITED STATES PATENT OFFICE.

HARRY B. HULL, OF DAYTON, OHIO, ASSIGNOR TO DELCO-LIGHT COMPANY, OIF

- y DAYTON, OHIO, A CORPORATION OF DELAWARE.

REFBIGEBATING APPARATUS.

Application led August 7,

This invention relates to refrigerating apparatus of the type including a compressor which withdraws vaporized refrigerant from the cooling coils and forces and compresses it into a condenser in which the refrzigerant is liquefied,jand an expansion valve which delivers liquid refrigerant in limited quantities to the cooling coil.

One of the objects of the present invention is to control the compressor in accordance with the temperature of gasified refrigerant from the cooling coil so that the cornpressor will be started at a certain high temperature and will be stopped at a certain low temperature, and also cause the compressor 'to stop in case an abnormal amount of liquid refrigerant enters the cooling coil.

Another object of the invention is to prevent liquid refrigerant getting into the suction line in case the expansion valve allows too much refrigerant to pass into the cooling coils, thereby preventing damage'to the compressor and preventing ineicient operation of the system.

Further objects and advantages of the present invention will be apparent from the following description, .reference being had to the accompanying drawing, wherein a preferred embodiment of one form of the invention is clearly shown.

In the drawing:

Fig. l is a diagram of a refrigerating system employing the present invention.

Fig. 2y is a view on a larger scale than Fig. 1 showing in section the brine tank which surrounds the cooling coils and a portion of the controlling apparatus.

The compressor 20, which is driven by mo tor 21 through the belt and pulley connections 22, 23, and 24, is connected with a condenser 25 which is cooled in any suitable manner not shown. Condenser 25 is connected with an expansion valve 26 `which operates in a well known manner to admit limited quantities of liquid refrigerant to the cooling coil.

Referring to Fig. 2, valve 26 is connected with the evaporator comprising a cooling coil 27 immersed in brine contained in the brine tank 28. The level of the'brine is indicated at 29. A chamber or well 30 is supported by the top wall of the brine tank and Vincludes a portion. immersed in the lbrine and connectedv at the bottom with a cooling coil 21. The well 30 is provided 1924. Serial No. 730,704.

with a covei` 31 attached by screws 32. The cover 31 supports a sealed vessel 33 containing a relatively volatile liquid such as a` The vessel is connected menthyl chloride.

pressure controlled elecand when the pressure is high, this circuit l will be closed. The outlet of the well 30 is connected by a pipe 36 which leads to the inlet of the compressor 20.

-Assuming that the `com ressor is in operation and that liquid re rigerant is being delivered from the condenser 25 to the cooling coil 27, the expansion valve 26 is`adjust' ed so that the desired amount of liquid refrigerant will be admitted to the cooling coil 27. The .liquid will evaporate and cool the brine and normally only-gasiied refrigerant will pass into the well 30. When the temperature in the Well 30 is reduced to a certain low value, the compressor will be stopped. This occurs by reason of the reduction of pressure in the pipe 34 and champber 33 as the result of the lowering of the temperature of the volatile liquid therein. lVhen the pressure is reduced in pipe 34, the switch 35 opens the motor circuit. When vthe temperature in the well 30 reaches a certain high value, the liquid in the chamber 33 will expand and increase the pressure in the pipe 34, thereby causing the switch 35 to be closed and the motor will again drive the compressor.

Under abnormal conditions, that is, in case the expansion valve should permit too much liquid refrigerant to pass into the cooling coil 27, this liquid refrigerant will accumulate in the well 30 and will cause the thermostat cup 33 to be cooled, thereby reducing the pressure in the pipe 34 and causing the switch 35 to stop the motor. The well 30 is of sutiicient size to collect a considerable quantity of liquid refrigerant. Since the compressor is stopped before the liquid refrigerant enters pipe 36, substantially all refrigeration-will take place within the coil 27, and dama e' to the compressor which might occur if t e compressor were forced to pump a liquid, is prevented. Thus the efficiency and the life of the refrigis delivered to the cooling coil, the operation ofA the "system is not hindered, since this liquid is retained within the brine tank and allowed to evaporate before the pump is started into operation again.

- While the form of embodiment of the in` vention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

e 1. Refrigerating apparatus comprising in combination, an evaporator, means for Withdravving refrigerant from the evaporator and for condensing sald refrigerant and for forclng the same into the evaporator, a valve lfor controlling the admisison of refrigerant tothe evaporator from said means, and;

means associated with the outlet of the evaporator'A and responsive to the 'temperature of gasiiied refrigerant and tothe delivery of an excessive amount of liquid reffrigerant to the evaporator for controlling the rst means.

2. Refrigerating apparatus comprising in combination, an evaporator, means for Withdrawing refrigerant from the evaporator and for condensing said refrigerant and for forcing the same into the evaporator, a valve for controlling the admission of refrigerant to the evaporator from said means, and means associated with the outlet of the evaporator and responsive to the accumulation of a certain amount of refrigerant in the evaporator for rendering the irst means inoperative.`

3. Refrigerating apparatus comprising, in combination, a compressor, a condenserand cooling coil in series vvith the compressor, valve controlling the admission of refrigerant to the cooling coil, a reservoir in the refrigerant line for receiving a quantity of liquid refrigerant in case of abnormal iow of liquid refrigerant into the cooling coil,

Lacasse and means responsive to the accumulation of a certain amount ofv liquid refrigerant in said reservoir for 'stopping the compressor.

4. Refrigeratirig apparatus comprising, in combination,.'a compressor, a condenser and cooling-coil in series with the compressor, valve controlling the admission ofrefrigerant v'to the cooling coil, a reservoir in series with the coolin coil and compressor and located above t e cooling coil, and means responsive tothe accumulation of a certain amount of liquid refrigerant in said reservoir for stopping the compressor, said excess liquid refrigerant flowing back into the coil While the compressor is stopped.

5. Refrigerating apparatus comprising, in combination, a compressor, a condenser and cooliugrcoil in series with the compressor, valve controlling the admission of. refrigerant to the cooling coil, a reservoir in series with the cooling coil and compressor and located above the cooling coil and temperature responsive means extending Within said reservoir for stopping the compressor when the temperature of the gasitied refrigerant in the reservoir is at a certain low value, or when a certain amount of liquid refrigerant has accumulated in the reservoir, and for starting the compressor when the temperature within thereservoir has attained a certain high value.

6. Refrigeratingapparatus comprising, in combination, a compressor, a condenser and cooling coil in series with the compressor, valve controlling the admission of refrigerant, `to the cooling coil, a reservoir in the refrigerant line for receiving gasiied refrigerant from the cooling coil, and for receiving liquid refri erant in case of abe normal ilovv of liqui refrigerant into the cooling coil, and temperature responsive means extending Within said reservoir for stopping the compressor when the temperature of the gasified refrigerant' in the reservoir is at a certain low value, or when a certain amount of liquid refrigerant has accumulated in thereservoir, and for starting the compressor When the temperature Within the'reservoir has attained a certain high value. l

in testimony whereof L signature.

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